CN104362920A - Self-adaptive magnetizing inrush current restraining device and method thereof - Google Patents

Self-adaptive magnetizing inrush current restraining device and method thereof Download PDF

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Publication number
CN104362920A
CN104362920A CN201410568437.5A CN201410568437A CN104362920A CN 104362920 A CN104362920 A CN 104362920A CN 201410568437 A CN201410568437 A CN 201410568437A CN 104362920 A CN104362920 A CN 104362920A
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China
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module
phase
switch
closing
phase angle
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CN104362920B (en
Inventor
王树刚
陆钟华
王�琦
陆圣芝
胡兵
陈福锋
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nanjing SAC Automation Co Ltd
Yangzhou Power Supply Co of Jiangsu Electric Power Co
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Nanjing SAC Automation Co Ltd
Yangzhou Power Supply Co of Jiangsu Electric Power Co
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Application filed by State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, Nanjing SAC Automation Co Ltd, Yangzhou Power Supply Co of Jiangsu Electric Power Co filed Critical State Grid Corp of China SGCC
Priority to CN201410568437.5A priority Critical patent/CN104362920B/en
Priority to PCT/CN2014/091989 priority patent/WO2016061866A1/en
Publication of CN104362920A publication Critical patent/CN104362920A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Protection Of Transformers (AREA)
  • Keying Circuit Devices (AREA)

Abstract

The invention discloses a self-adaptive magnetizing inrush current restraining device and a method thereof. According to the method, the state of a transformer before no-load closing is considered comprehensively, and different control strategies are adopted according to different states; during local manual opening or distant remote-control opening, an angle identical to an opening phase angle is selected for closing; during tripping caused by short-circuit faults, magnetizing inrush currents at the moments of different closing phase angles in the range of 0-360 degrees are estimated according to three-phase voltage information at the moment of opening to acquire a closing phase angle corresponding to the minimum magnetizing inrush current; during man-made demagnetization after opening, the angle of any one of three phases is selected as 90 degrees. The magnetizing inrush current restraining device produced according to the method has the advantages of capability of automatically recognizing the state of the transformer before no-load closing and executing the corresponding control strategy, capability of automatically learning time needed by switch closing and automatically adjusting closing exit triggering moments and function of protecting the whole electric quantity of the transformer.

Description

A kind of adaptive transformer inrush current suppression apparatus and method
Technical field
The present invention relates to power system automation technology field, be specifically related to a kind of adaptive transformer inrush current suppression apparatus and method.
Background technology
Power transformer is extremely important electric equipment in electric power system, and whether its safe operation, and can be directly connected to electric power system work continuously and stably.When transformer steady operation, transformer magnetizing current is only 1% ~ 10% of rated current.But when transformer during no-load closing moment, due to the existence of transformer core Flux saturation, relict flux and the nonlinear characteristic of core material, the sizable magnetizing inrush current of amplitude can be produced, through several weeks, the transient process of ripple reaches stable state, and the switching current of this impact often can reach 6 ~ 8 times of rated current.In addition, this magnetizing inrush current will cause the fluctuation of this regional voltage again, causes, with the change of the transformer magnetizing current of its paired running, namely producing sympathetic inrush.Transformer differential protection misoperation may be caused thus, transformer insulated damage, winding deformation, reduce power system power supply quality simultaneously.
Closing a floodgate due to phase selection position suppresses magnetizing inrush current method not need to increase primary equipment investment, and can eliminate magnetizing inrush current in theory, therefore becomes the study hotspot that current transformer excitation flow suppresses.Its general principle is the voltage phase angle by the control transformer idle-loaded switching-on moment, the induction magnetic flux that closing moment voltage is produced and the residual flux of transformer reach unanimity, avoid the magnetizing inrush current because magnetic flux conflict causes, limit amplitude and the transient process of magnetizing inrush current to greatest extent.
Scholars propose the control method of multiple suppression magnetizing inrush current based on phase selection position combined floodgate technology in recent years, the rapid closing method controlled as split-phase switch and delay combined floodgate method, the same separating brake phase angle combined floodgate method etc. that threephase switch controls.With regard to existing magnetizing inrush current suppressing method and device, mainly have the following disadvantages.
1, too much study the surge suppression method of individual-phase control, and for power transformer, especially shove general larger mesolow power transformer or box type transformer, do not possess the condition of phase-splitting console switch, therefore there is limitation in this class methods practical application.
2, existing magnetizing inrush current suppressing method, considers that transformer trips because of short trouble, and magnetizing inrush current suppression problem when tripping operation descendant be demagnetization.
3, existing magnetizing inrush current inhibitory control method; the separating brake phase angle of usual control switch in advance; such as control A phase 0 ° of separating brake; and then close a floodgate with 0 ° of angle; this control strategy can not be applied to transformer short circuit fault situation; because consider rapidity, protective device must trip with the fastest speed, and certain angle can not be selected to trip.
4, existing magnetizing inrush current suppressing method, needs the operate time of setting switch usually, and this way is not easy to engineer applied on the one hand, on the other hand, along with the passing of switching mechanism running time, its operate time also will change, thus can affect the inhibition of magnetizing inrush current.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of adaptive transformer inrush current suppression apparatus and method.The method can solve the magnetizing inrush current problem of power transformer under various different state during idle-loaded switching-on.
Close a floodgate and suppress the general principle of magnetizing inrush current as follows in phase selection position: the dominant mechanism that magnetizing inrush current produces is that the non-linear of transformer core excitation and magnetic flux can not suddenly change, when closing moment voltage produce induction magnetic flux and transformer residual flux inconsistent time, for offsetting this magnetic flux conflict, follow the basic law that magnetic flux can not suddenly change, need generation larger exciting current, be magnetizing inrush current.The general principle of controlled closing technology is exactly the initial phase angle by controlling closing moment voltage, makes to respond to magnetic flux in advance equal with residual flux, reaches and suppresses transient state magnetic flux, enter the object of stable state magnetic flux state fast.
Based on above-mentioned analysis, the technical scheme that the present invention takes is as follows:
A kind of adaptive transformer inrush current suppression apparatus, comprise analogue collection module, main control module, communication module, open into module, output module and human-computer interaction module, main control module respectively with analogue collection module, open into module, output module, communication module is connected, communication module is connected with human-computer interaction module.
Image data for gathering alternating voltage, electric current secondary singal, and is sent to master control module by analogue collection module;
Open into module for gathering the On-off signal signal of the position of the switch, function pressing plate, and it is mutual to carry out internal data by communication bus and master control module;
Output module for receiving and dispatching divide-shut brake order, and it is mutual to carry out internal data by communication and master control module;
Master control module is used for process and the logical operation of data; comprise relay protection module and magnetizing inrush current suppression module; when transformer is short-circuited fault; the backward module of outputing of relay protection function Module recognition fault sends trip command; and be labeled as short trouble tripping operation be sent to magnetizing inrush current suppression module, magnetizing inrush current functional module completes the calculating of best closing phase angle according to control strategy.
Master control module receive gathered by analogue collection module electric current, voltage signal, open into module gather switch position signal; through the relay protective scheme computing of relay protection module and the magnetizing inrush current inhibitory control algorithm computing of magnetizing inrush current suppression module; sending divide-shut brake instruction to outputing module, performing breaking-closing operating by outputing module.
Communication module is used for mutual to external information, and communication module receives operation result, the self-inspection information of master control module by internal bus, and so that the communication protocol of standard to deliver to external supervisory control system; Communication module receives external supervisory control system and issues remote control command, and the remote control command information after resolving is sent to master control module;
Described man-machine interaction module externally provides operation and display interface.
More preferably, communication bus is spi bus.
More preferably, man-machine interaction module comprises touch-screen, signal lamp, involution button.
The computing of magnetizing inrush current inhibitory control algorithm specifically comprises the following steps:
The switch separating brake situation of main control module record comprises switch remote control separating brake, switch because of fault trip and test demagnetization before closing a floodgate, and performs concrete control strategy according to switch separating brake situation, and concrete control strategy comprises:
A, during () switch remote control separating brake, best switching angle is the phase angle in separating brake moment, the closing phase angle of control A phase or B phase or C phase is identical with separating brake phase angle;
When () switch is because of fault trip b, the information in conjunction with the separating brake moment estimates Three-Phase Transformer remanent magnetism, show that three-phase shoves minimum closing phase angle by ergodic algorithm;
C () switch closes a floodgate before when test demagnetization, 90 ° of moment of A phase are selected to close a floodgate.
A kind of adaptive magnetizing inrush current suppressing method, comprises the following steps:
S01, switch closing time self study: communication module receives the remote control combined floodgate order of external supervisory control system, main control module is sent to by after combined floodgate command analysis, when master control module be identified as close a floodgate first time, send reclosing command to outputing module, complete closing operation by outputing module, open into module collection switch position signal and be sent to master control module, master control module record is issued to the position of the switch from reclosing command and closes required time t;
S02, switch separating brake information record: when switch receives the order of remote control separating brake, or due to transformer be short-circuited fault cause defencive function module trigger tripping operation time, main control module record switch remote control separating brake or trip protection, master control module is according to AC module and open the analog signals and switch position signal that gather into module, three-phase current, three-phase voltage information when record switch becomes point position from co-bit; Switch separating brake information record specifically comprises the following steps:
The position of the switch by triggering record ripple when closing variation, main control module recording voltage and electric current in the data of forward and backward each two cycles of switch changed position, through full wave Fourier algorithm compute switch position by the amplitude u closing variation moment three-phase voltage fa, u fb, u fc, and phase angle theta fa, θ fb, θ fc(θ fa, θ fb, θ fcfor separating brake phase angle), for the calculating of best switching angle provides initial data;
S03, calculates best closing phase angle α: according to the separating brake information of step S02 record, is calculated the best closing phase angle closed a floodgate next time, specifically comprise the following steps by main control module:
A (), when switch command separating brake, best closing phase angle α is the phase angle in separating brake moment, the closing phase angle of control A phase or B phase or C phase is identical with separating brake phase angle;
Switch remote control separating brake belongs to the situation of three-phase residual flux symmetry, when manual brake separating or remote control separating brake, all belong to order separating brake, due to the pre-magnetic flux of three-phase and three-phase residual flux all symmetrical, therefore as in the A phase of transformer, B phase, C phase, to meet pre-magnetic flux mutually equal with residual flux, then other two-phase also satisfies condition accordingly, namely one meets the pre-magnetic flux processing method equal with residual flux mutually and Inrush Current of Transformer suppresses processing method identical in A phase, B phase, C phase;
According to the electromagnetic induction principle of transformer, lead to the situation with excitation resistance pressure drop ignoring stray transformer flux, input voltage u (t) and static exciter magnetic flux φ (t) meet following relation:
u ( t ) = N dφ ( t ) dt - - - ( 1 )
If u (t)=U msin (ω t+ σ), then:
Wherein, U mfor the amplitude of input voltage u (t), σ is initial phase angle, for rated flux amplitude, N is the transformer primary side number of turn;
From formula (2), magnetic flux delayed phase voltage-phase 90 ° when transformer normally runs, supposes that Transformer Close initial phase angle is σ, and the phase angle in separating brake moment is ε, then the residual flux φ of transformer rfor:
Pre-induction magnetic flux φ (0+) during Transformer Close moment t=0 is:
Make the pre-induction magnetic flux of closing moment equal with residual flux, namely can control combined floodgate initial phase angle σ equal with the phase angle ε in separating brake moment last time;
Therefore, control closing phase angle identical with a front separating brake phase angle, can magnetizing inrush current be eliminated, namely the A phase of control transformer or the closing phase angle of B phase or C phase identical with separating brake phase angle.
When () switch is because of fault trip b, the best closing phase angle α that next time closes a floodgate calculates:
Estimate Three-Phase Transformer remanent magnetism, three-phase remanent magnetism formula is:
φ fa = - u fa U N φ e cos θ fa φ fb = - u fb U N φ e cos θ fb φ fc = - u fc U N φ e cos θ fc - - - ( 5 )
U in formula fa, θ fabe respectively amplitude and the phase angle of separating brake moment A phase voltage, u fb, θ fbbe respectively amplitude and the phase angle of separating brake moment B phase voltage, u fc, θ fcbe respectively amplitude and the phase angle of separating brake moment C phase voltage; φ efor transformer rated flux, U nfor transformer rated voltage.
φ fa, φ fb, φ fcbe respectively the remanent magnetism of transformer A phase, B phase, C phase;
Estimate the pre-induction magnetic flux of switch closing moment transformer, formula is:
φ a＝-φ ecosθ
φ b＝-φ ecos(θ-120°)
φc＝-φ ecos(θ+120°) (6)
Wherein, φ a, φ b, φ cfor the pre-induction magnetic flux of the A phase of switch closing moment transformer, B phase, C phase; θ is A phase voltage phase angle, θ ∈ (0 ° ~ 360 °);
Calculated by ergodic algorithm and obtain the minimum closing phase angle of magnetizing inrush current, best closing phase angle α is the minimum closing phase angle of magnetizing inrush current, and best closing phase angle α meets between 0 ° ~ 360 °
Max (| φ a-φ fa|, | φ b-φ fb|, | φ c-φ fc|) minimum closing phase angle.
Because switch belongs to the asymmetric situation of three-phase residual flux because of fault trip, and remanent magnetism is non-vanishing; Because residual flux is asymmetric, the condition that the pre-magnetic flux of three-phase is all equal with three-phase residual flux cannot be met, therefore cannot eliminate magnetizing inrush current in theory, suitable closing phase angle can only be chosen and guarantee that the maximum that the three phase excitation caused when closing a floodgate is shoved is minimum.For the situation of trip protection in transformer fault situation; can according to the calculating voltage magnitude in separating brake moment and the remanent magnetism of phase angular estimation transformer; find by algorithm traversal the pre-magnetic flux that closes a floodgate to conflict with residual flux minimum closing phase angle, reach the object that restriction is shoved.
Through test demagnetization c () switch closes a floodgate before, 90 ° of moment of A phase are selected to close a floodgate.
Because switch closes a floodgate front after test demagnetization, belong to the situation of three-phase residual flux symmetry, and remanent magnetism is zero, when remanent magnetism is zero, any phase voltage amplitude can be selected to be close a floodgate in the maximum moment, and now voltage magnitude is maximum phase transient state magnetic flux is zero, and the transient state magnetic flux of other two-phases is the stable state rated flux of 0.866 times, there is certain nargin in saturation flux simultaneously, and now magnetizing inrush current can suppress at reduced levels.
S04, the voltage phase angle β corresponding to compute switch combined floodgate trigger instants:
According to the switch combined floodgate required time t of step S01 record, and the best closing phase angle α that step S03 calculates, calculate the phase angle β of combined floodgate trigger instants, identical with the phase angle calculated in S03 to guarantee the phase angle of the actual closing moment of switch:
The best closing phase angle that this step calculates for revising step S03; T%20 represents 20 remainder numbers, owing to being a whole period of wave that 20ms, t%20 are for calculating the surplus after whole period of wave;
S05, close a floodgate and perform, when communication module receives the order of remote control combined floodgate, main control module is sent to after command analysis, after master control module receives reclosing command, the phase angle of Real-Time Monitoring A phase voltage, and compare A phase voltage phase angle equal with the combined floodgate trigger phase angle β that step S04 calculates time, to output module send reclosing command (this moment is combined floodgate trigger instants);
After combined floodgate execution terminates, master control module monitors the position of the switch, record closes required time from combined floodgate trigger instants to switch, upgrade for automatic learning switch closing time, corrected parameter is provided, i.e. the switch combined floodgate required time t of step of updating S01 record for performing switch combined floodgate trigger instants calculating next time;
Also comprise automatic learning switch closing time after step S05 to upgrade: specifically comprise the following steps:
Communication module receives the order of remote control combined floodgate, main control module is sent to after command analysis, best phase angle is selected to close a floodgate by master control module according to control strategy, and send reclosing command to outputing module, complete closing operation by outputing module, master control module record is issued to the position of the switch from reclosing command and closes required time.Automatic learning switch combined floodgate required time comprises device relay actuation time, operation circuit relay actuation time and breaker trip time etc.
Compared with prior art, tool of the present invention has the following advantages:
The state that may exist before 1, comprehensively considering power transformer idle-loaded switching-on, and take different control strategies according to different states, do not need human intervention, there is adaptivity;
2, propose power transformer because of after short trouble causes tripping operation, and without people be close a floodgate in demagnetization situation time magnetizing inrush current suppressing method, solve the limitation that existing magnetizing inrush current engineering is applied;
3, contemplated by the invention practical application, during separating brake, do not do any control, only record its separating brake moment current-voltage information, analyze and draw best closing phase angle, therefore can not affect the rapidity of protection;
4, the present invention can the closing time of identification switch automatically, and namely reclosing command is issued to switch and closes required time, has self-study habit;
5, device possesses transformer relay protecting function and magnetizing inrush current inhibit feature simultaneously, therefore without the need to configuring transformer inrush current suppression apparatus separately, both having simplified secondary installing wiring, and having reduced cost of investment, and be convenient to again operation maintenance work.
According to the magnetizing inrush current device that the method is developed, there is following characteristics: can automatically identify the state before transformer during no-load closing, and perform corresponding control strategy; Can automatic learning switch combined floodgate required time, and adjustment is closed a floodgate outlet trigger instants automatically; Device possesses a complete set of electric quantity protective function of transformer simultaneously.
Accompanying drawing explanation
Fig. 1 adaptive transformer inrush current suppression apparatus of the present invention and transformer connecting structure schematic diagram;
Fig. 2 is adaptive transformer inrush current suppression apparatus structural representation of the present invention;
Fig. 3 is a kind of adaptive magnetizing inrush current suppressing method flow chart of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of adaptive transformer inrush current suppression apparatus, comprise analogue collection module (AC module), main control module (master control module), communication module (communication module), open into module (opening into module), output module (outputing module) and human-computer interaction module (HMI module), main control module respectively with analogue collection module, open into module, output module, communication module is connected, communication module is connected with human-computer interaction module; Analogue collection module (AC module) is several.
Image data for gathering alternating voltage, electric current secondary singal, and is sent to master control module by analogue collection module;
Open into module for gathering the On-off signal signal of the position of the switch, function pressing plate, and it is mutual to carry out internal data by SPI (Serial Peripheral Interface synchronous serial Peripheral Interface) bus and master control module;
Output module for receiving and dispatching divide-shut brake order, and it is mutual to carry out internal data by spi bus and master control module;
Master control module is used for process and the logical operation of data, comprise relay protection module and magnetizing inrush current suppression module, when transformer is short-circuited fault, the backward module of outputing of relay protection function Module recognition fault sends trip command, and be labeled as short trouble tripping operation be sent to magnetizing inrush current suppression module, magnetizing inrush current functional module completes the calculating of best closing phase angle according to control strategy;
Master control module receive gathered by analogue collection module electric current, voltage signal, open into module gather switch position signal; through the relay protective scheme computing of relay protection module and the magnetizing inrush current inhibitory control algorithm computing of magnetizing inrush current suppression module; sending divide-shut brake instruction to outputing module, performing breaking-closing operating by outputing module.
Communication module is used for mutual to external information, and communication module receives operation result, the self-inspection information of master control module by internal bus, and so that the communication protocol of standard to deliver to external supervisory control system; Communication module receives external supervisory control system and issues remote control command, and the remote control command information after resolving is sent to master control module.
Man-machine interaction module externally provides operation and display interface, comprises touch-screen, signal lamp, involution button.
The computing of magnetizing inrush current inhibitory control algorithm specifically comprises the following steps (computing of magnetizing inrush current inhibitory control algorithm is the adaptive magnetizing inrush current suppressing method of one provided by the invention):
The switch separating brake situation of main control module record comprises switch remote control separating brake, switch because of fault trip and test demagnetization before closing a floodgate, and performs concrete control strategy according to switch separating brake situation, and concrete control strategy comprises:
A, during () switch remote control separating brake, best switching angle is the phase angle in separating brake moment, the closing phase angle of control A phase or B phase or C phase is identical with separating brake phase angle;
When () switch is because of fault trip b, the information in conjunction with the separating brake moment estimates Three-Phase Transformer remanent magnetism, show that three-phase shoves minimum closing phase angle by ergodic algorithm;
C () switch closes a floodgate before when test demagnetization, 90 ° of moment of A phase are selected to close a floodgate.
In the adaptive transformer inrush current suppression apparatus of the present invention, the magnetizing inrush current inhibitory control algorithm computing of magnetizing inrush current suppression module just refers to the adaptive magnetizing inrush current suppressing method of one provided by the invention.
As shown in Figure 3, a kind of adaptive magnetizing inrush current suppressing method, comprises the following steps:
S01, switch closing time self study: communication module receives the remote control combined floodgate order of external supervisory control system, main control module is sent to by after combined floodgate command analysis, when master control module be identified as close a floodgate first time, send reclosing command to outputing module, complete closing operation by outputing module, open into module collection switch position signal and be sent to master control module, master control module record is issued to the position of the switch from reclosing command and closes required time t;
S02, switch separating brake information record: when switch receives the order of remote control separating brake, or due to transformer be short-circuited fault cause defencive function module trigger tripping operation time, main control module record switch remote control separating brake or trip protection, master control module is according to AC module and open the analog signals and switch position signal that gather into module, three-phase current, three-phase voltage information when record switch becomes point position from co-bit; Switch separating brake information record specifically comprises the following steps:
The position of the switch by triggering record ripple when closing variation, main control module recording voltage and electric current in the data of forward and backward each two cycles of switch changed position, through full wave Fourier algorithm compute switch position by the amplitude u closing variation moment three-phase voltage fa, u fb, u fc, and phase angle theta fa, θ fb, θ fc(i.e. separating brake phase angle), for the calculating of best switching angle provides initial data;
S03, calculates best closing phase angle α: according to the separating brake information of step S02 record, is calculated the best closing phase angle closed a floodgate next time, specifically comprise the following steps by main control module:
A (), when switch command separating brake, best closing phase angle α is the phase angle in separating brake moment, the closing phase angle of control A phase or B phase or C phase is identical with separating brake phase angle;
Switch remote control separating brake belongs to the situation of three-phase residual flux symmetry, when manual brake separating or remote control separating brake, all belong to order separating brake, due to the pre-magnetic flux of three-phase and three-phase residual flux all symmetrical, therefore as in the A phase of transformer, B phase, C phase, to meet pre-magnetic flux mutually equal with residual flux, then other two-phase also satisfies condition accordingly, namely one meets the pre-magnetic flux processing method equal with residual flux mutually and Inrush Current of Transformer suppresses processing method identical in A phase, B phase, C phase;
According to the electromagnetic induction principle of transformer, lead to the situation with excitation resistance pressure drop ignoring stray transformer flux, input voltage u (t) and static exciter magnetic flux φ (t) meet following relation:
u ( t ) = N dφ ( t ) dt - - - ( 1 )
If u (t)=U msin (ω t+ σ), then:
Wherein, U mfor the amplitude of input voltage u (t), σ is initial phase angle, for rated flux amplitude, N is the transformer primary side number of turn;
From formula (3.2), magnetic flux delayed phase voltage-phase 90 ° when transformer normally runs, supposes that Transformer Close initial phase angle is σ, and the phase angle in separating brake moment is ε, then the residual flux φ of transformer rfor:
Pre-induction magnetic flux φ (0+) during Transformer Close moment t=0 is:
Make the pre-induction magnetic flux of closing moment equal with residual flux, namely can control combined floodgate initial phase angle σ equal with the phase angle ε in separating brake moment last time;
Therefore, control closing phase angle identical with a front separating brake phase angle, can magnetizing inrush current be eliminated, namely the A phase of control transformer or the closing phase angle of B phase or C phase identical with separating brake phase angle.
When () switch is because of fault trip b, the best closing phase angle α that next time closes a floodgate calculates:
Estimate Three-Phase Transformer remanent magnetism, three-phase remanent magnetism formula is:
φ fa = - u fa U N φ e cos θ fa φ fb = - u fb U N φ e cos θ fb φ fc = - u fc U N φ e cos θ fc - - - ( 5 )
U in formula fa, θ fabe respectively amplitude and the phase angle of separating brake moment A phase voltage, u fb, θ fbbe respectively amplitude and the phase angle of separating brake moment B phase voltage, u fc, θ fcbe respectively amplitude and the phase angle of separating brake moment C phase voltage; φ efor transformer rated flux, U nfor transformer rated voltage.
φ fa, φ fb, φ fcbe respectively the remanent magnetism of transformer A phase, B phase, C phase;
Estimate the pre-induction magnetic flux of switch closing moment transformer, formula is formula (6):
φ a＝-φ ecosθ
φ b＝-φ ecos(θ-120°) (6)
φc＝-φ ecos(θ+120°)；
In its Chinese style (6), φ a, φ b, φ cfor the pre-induction magnetic flux of switch closing moment transformer; Wherein θ is A phase voltage phase angle, θ ∈ (0 ° ~ 360 °).
Calculated by ergodic algorithm and obtain the minimum closing phase angle of magnetizing inrush current, best closing phase angle α is the minimum closing phase angle of magnetizing inrush current, and best closing phase angle α meets between 0 ° ~ 360 °
Max (| φ a-φ fa|, | φ b-φ fb|, | φ c-φ fc|) minimum closing phase angle.
Because switch belongs to the asymmetric situation of three-phase residual flux because of fault trip, and remanent magnetism is non-vanishing; Because residual flux is asymmetric, the condition that the pre-magnetic flux of three-phase is all equal with three-phase residual flux cannot be met, therefore cannot eliminate magnetizing inrush current in theory, suitable closing phase angle can only be chosen and guarantee that the maximum that the three phase excitation caused when closing a floodgate is shoved is minimum.For the situation of trip protection in transformer fault situation; can according to the calculating voltage magnitude in separating brake moment and the remanent magnetism of phase angular estimation transformer; find by algorithm traversal the pre-magnetic flux that closes a floodgate to conflict with residual flux minimum closing phase angle, reach the object that restriction is shoved.
Through test demagnetization c () switch closes a floodgate before, 90 ° of moment of A phase are selected to close a floodgate.
Because switch closes a floodgate front after test demagnetization, belong to the situation of three-phase residual flux symmetry, and remanent magnetism is zero, when remanent magnetism is zero, any phase voltage amplitude can be selected to be close a floodgate in the maximum moment, and now voltage magnitude is maximum phase transient state magnetic flux is zero, and the transient state magnetic flux of other two-phases is the stable state rated flux of 0.866 times, there is certain nargin in saturation flux simultaneously, and now magnetizing inrush current can suppress at reduced levels.
S04, the voltage phase angle β corresponding to compute switch combined floodgate trigger instants:
According to the switch combined floodgate required time t of step S01 record, and the best closing phase angle α that step S03 calculates, calculate the phase angle β of combined floodgate trigger instants, identical with the phase angle calculated in S03 to guarantee the phase angle of the actual closing moment of switch:
T%20 represents 20 remainder numbers, owing to being a whole period of wave that 20ms, t%20 are for calculating the surplus after whole period of wave;
S05, close a floodgate and perform, when communication module receives the order of remote control combined floodgate, main control module is sent to after command analysis, after master control module receives reclosing command, the phase angle of Real-Time Monitoring A phase voltage, and compare A phase voltage phase angle equal with the combined floodgate trigger phase angle β that step S04 calculates time, to output module send reclosing command (this moment is combined floodgate trigger instants);
After combined floodgate execution terminates, master control module monitors the position of the switch, record closes required time from combined floodgate trigger instants to switch, upgrade for automatic learning switch closing time, corrected parameter is provided, i.e. the switch combined floodgate required time t of step of updating S01 record for performing switch combined floodgate trigger instants calculating next time;
Also comprise automatic learning switch closing time after step S05 to upgrade: specifically comprise the following steps:
Communication module receives the order of remote control combined floodgate, main control module is sent to after command analysis, best phase angle is selected to close a floodgate by master control module according to control strategy, and send reclosing command to outputing module, complete closing operation by outputing module, master control module record is issued to the position of the switch from reclosing command and closes required time.Automatic learning switch combined floodgate required time comprises device relay actuation time, operation circuit relay actuation time and breaker trip time etc.
Those skilled in the art can change the present invention or modification design but do not depart from thought of the present invention and scope.Therefore, if these amendments of the present invention and modification belong within the claims in the present invention and equivalent technical scope thereof, then the present invention is also intended to comprise these change and modification.

Claims (7)

1. an adaptive transformer inrush current suppression apparatus, it is characterized in that, comprise analogue collection module, main control module, communication module, open into module, output module and human-computer interaction module, described main control module respectively with described analogue collection module, open into module, output module, communication module is connected, described communication module is connected with described human-computer interaction module;
Image data for gathering alternating voltage, electric current secondary singal, and is sent to master control module by described analogue collection module;
Describedly to open into module for gathering the On-off signal signal of the position of the switch, function pressing plate, and it is mutual to carry out internal data by communication bus and master control module;
Described module of outputing is for receiving and dispatching divide-shut brake order, and it is mutual to carry out internal data by communication bus and master control module;
Master control module is used for process and the logical operation of data, comprise relay protection module and magnetizing inrush current suppression module, when transformer is short-circuited fault, the backward module of outputing of relay protection function Module recognition fault sends trip command, and be labeled as short trouble tripping operation be sent to magnetizing inrush current suppression module, described magnetizing inrush current functional module completes the calculating of best closing phase angle according to magnetizing inrush current control algolithm;
Described master control module receive gathered by analogue collection module electric current, voltage signal, open into module gather switch position signal, through the relay protective scheme computing of relay protection module and the magnetizing inrush current inhibitory control algorithm computing of magnetizing inrush current suppression module, sending divide-shut brake instruction to outputing module, performing breaking-closing operating by outputing module;
Communication module is used for mutual to external information, and described communication module receives operation result, the self-inspection information of master control module by internal bus, and so that the communication protocol of standard to deliver to external supervisory control system; Described communication module receives external supervisory control system and issues remote control command, and the remote control command information after resolving is sent to master control module;
Described man-machine interaction module externally provides operation and display interface.
2. the adaptive transformer inrush current suppression apparatus of one according to claim 1, is characterized in that, described communication bus is spi bus.
3. the adaptive transformer inrush current suppression apparatus of one according to claim 1, is characterized in that,
Described man-machine interaction module comprises touch-screen, signal lamp, involution button.
4. the adaptive transformer inrush current suppression apparatus of one according to claim 1, is characterized in that,
The computing of described magnetizing inrush current inhibitory control algorithm specifically comprises the following steps:
The switch separating brake situation of main control module record comprises switch remote control separating brake, switch because of fault trip and test demagnetization before closing a floodgate, and performs concrete control strategy according to described switch separating brake situation, and described concrete control strategy comprises:
A, during () switch remote control separating brake, best switching angle is the phase angle in separating brake moment, the closing phase angle of control A phase or B phase or C phase is identical with separating brake phase angle;
When () switch is because of fault trip b, by ergodic algorithm, calculating transformer three-phase remanent magnetism, show that three-phase shoves minimum closing phase angle;
C () switch closes a floodgate before when test demagnetization, 90 ° of moment of A phase are selected to close a floodgate.
5. an adaptive magnetizing inrush current suppressing method, is characterized in that, comprise the following steps:
S01, switch closing time self study: communication module receives the remote control combined floodgate order of external supervisory control system, main control module is sent to by after combined floodgate command analysis, when master control module be identified as close a floodgate first time, send reclosing command to outputing module, complete closing operation by outputing module, described in open and gather switch position signal be sent to master control module into module, described master control module record is issued to the position of the switch from reclosing command and closes required time t;
S02, switch separating brake information record: when switch receives the order of remote control separating brake, or due to transformer be short-circuited fault cause defencive function module trigger tripping operation time, main control module record switch remote control separating brake or trip protection event, master control module is according to AC module and open the analog signals and switch position signal that gather into module, three-phase current, three-phase voltage information when record switch becomes point position from co-bit;
S03, calculates best closing phase angle α: according to the separating brake information of step S02 record, is calculated the best closing phase angle closed a floodgate next time, specifically comprise the following steps by main control module:
A (), when switch remote control separating brake, best closing phase angle α is the phase angle in described separating brake moment, and the closing phase angle of control A phase or B phase or C phase is identical with separating brake phase angle;
When () switch is because of fault trip b, calculate the best closing phase angle α closed a floodgate next time:
Estimate Three-Phase Transformer remanent magnetism, described three-phase remanent magnetism formula is:
φ fa = - u fa U N φ e cos θ fa
φ fb = - u fb U N φ e cos θ fb - - - ( 5 )
φ fc = - u fc U N φ e cos θ fc
In formula:
U in formula fa, θ fabe respectively amplitude and the phase angle of separating brake moment A phase voltage, u fb, θ fbbe respectively amplitude and the phase angle of separating brake moment B phase voltage, u fc, θ fcbe respectively amplitude and the phase angle of separating brake moment C phase voltage; φ efor transformer rated flux, U nfor transformer rated voltage;
φ fa, φ fb, φ fcbe respectively the remanent magnetism of transformer A phase, B phase, C phase;
Estimate the pre-induction magnetic flux of switch closing moment transformer, formula is:
φ a＝-φ ecosθ
φ b＝-φ ecos(θ-120°)
φc＝-φ ecos(θ+120°)
Wherein, θ is A phase voltage phase angle, θ ∈ (0 ° ~ 360 °), φ a, φ b, φ cfor the pre-induction magnetic flux of the A phase of switch closing moment transformer, B phase, C phase;
Calculated by ergodic algorithm and obtain the minimum closing phase angle of magnetizing inrush current, the minimum closing phase angle of magnetizing inrush current is described best closing phase angle α, described best closing phase angle α be meet between 0 ° ~ 360 ° max (| φ a-φ fa|, | φ b-φ fb|, | φ c-φ fc|) minimum phase angle;
Through test demagnetization c () switch closes a floodgate before, A phase or B phase or 90 ° of moment of C phase is selected to close a floodgate;
S04, the voltage phase angle β corresponding to compute switch combined floodgate trigger instants:
According to the switch combined floodgate required time t of step S01 record, and the best closing phase angle α that step S03 calculates, calculate the phase angle β of combined floodgate trigger instants, the phase angle realizing the actual closing moment of switch is identical with the phase angle calculated in S03:
S05, close a floodgate and perform, when communication module receives the order of remote control combined floodgate, main control module is sent to after remote control combined floodgate command analysis, after master control module receives reclosing command, the phase angle of Real-Time Monitoring A phase voltage, and compare A phase voltage phase angle equal with the combined floodgate trigger phase angle β that step S04 calculates time, to output module send reclosing command.
6. the adaptive magnetizing inrush current suppressing method of one according to claim 5, is characterized in that, described step S01 switch separating brake information record specifically comprises the following steps:
The position of the switch by triggering record ripple when closing variation, main control module recording voltage and electric current in the data of forward and backward each two cycles of switch changed position, through full wave Fourier algorithm compute switch position by the amplitude u closing variation moment three-phase voltage fa, u fb, u fc, and phase angle theta fa, θ fb, θ fc, for the calculating of best switching angle provides initial data.
7. the adaptive magnetizing inrush current suppressing method of one according to claim 5, it is characterized in that, further comprising the steps of after described step S05, master control module monitors the position of the switch, record closes required time from combined floodgate trigger instants to switch, automatic learning switch closing time upgrades, and provides corrected parameter for performing switch combined floodgate trigger instants calculating next time;
Described automatic learning switch closing time upgrades: specifically comprise the following steps:
Communication module receives the order of remote control combined floodgate, main control module is sent to after command analysis, best phase angle is selected to close a floodgate by master control module according to control strategy, and send reclosing command to outputing module, complete closing operation by outputing module, described master control module record is issued to the position of the switch from reclosing command and closes required time.
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CN109038491A (en) * 2018-07-05 2018-12-18 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 A kind of large-scale power transformer excitation surge current suppressing method
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CN112009312A (en) * 2020-07-08 2020-12-01 中车株洲电力机车研究所有限公司 Method and equipment for restraining magnetizing inrush current of traction transformer by ground passing through neutral section
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CN109038491A (en) * 2018-07-05 2018-12-18 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 A kind of large-scale power transformer excitation surge current suppressing method
CN109245047A (en) * 2018-10-23 2019-01-18 国家电网公司 A kind of 110kV transformer excitation flow inhibits device and suppressing method
CN109245047B (en) * 2018-10-23 2024-03-08 国家电网公司 110kV transformer excitation surge suppression device and suppression method
CN110993251A (en) * 2019-11-06 2020-04-10 中国电力科学研究院有限公司 Phase selection and switching-off based transformer core demagnetization method and system
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CN112009312B (en) * 2020-07-08 2022-03-11 中车株洲电力机车研究所有限公司 Method and equipment for restraining magnetizing inrush current of traction transformer by ground passing through neutral section
CN112009312A (en) * 2020-07-08 2020-12-01 中车株洲电力机车研究所有限公司 Method and equipment for restraining magnetizing inrush current of traction transformer by ground passing through neutral section
CN112564039A (en) * 2020-11-25 2021-03-26 神华福能发电有限责任公司 Adaptive transformer inrush current suppression method
CN112763801A (en) * 2021-04-07 2021-05-07 国网江西省电力有限公司电力科学研究院 Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station
CN113889972A (en) * 2021-09-18 2022-01-04 华中科技大学 Method and device for inhibiting no-load closing excitation inrush current of three-phase transformer
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